diff --git a/services/oboeservice/AAudioServiceStreamShared.h b/services/oboeservice/AAudioServiceStreamShared.h
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+++ b/services/oboeservice/AAudioServiceStreamShared.h
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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AAUDIO_AAUDIO_SERVICE_STREAM_SHARED_H
+#define AAUDIO_AAUDIO_SERVICE_STREAM_SHARED_H
+
+#include "fifo/FifoBuffer.h"
+#include "binding/AAudioServiceMessage.h"
+#include "binding/AAudioStreamRequest.h"
+#include "binding/AAudioStreamConfiguration.h"
+
+#include "AAudioService.h"
+#include "AAudioServiceStreamBase.h"
+
+namespace aaudio {
+
+// We expect the queue to only have a few commands.
+// This should be way more than we need.
+#define QUEUE_UP_CAPACITY_COMMANDS (128)
+
+class AAudioEndpointManager;
+class AAudioServiceEndpoint;
+class SharedRingBuffer;
+
+/**
+ * One of these is created for every MODE_SHARED stream in the AAudioService.
+ *
+ * Each Shared stream will register itself with an AAudioServiceEndpoint when it is opened.
+ */
+class AAudioServiceStreamShared : public AAudioServiceStreamBase {
+
+public:
+    AAudioServiceStreamShared(android::AAudioService &aAudioService);
+    virtual ~AAudioServiceStreamShared();
+
+    aaudio_result_t open(const aaudio::AAudioStreamRequest &request,
+                         aaudio::AAudioStreamConfiguration &configurationOutput) override;
+
+    /**
+     * Start the flow of audio data.
+     *
+     * This is not guaranteed to be synchronous but it currently is.
+     * An AAUDIO_SERVICE_EVENT_STARTED will be sent to the client when complete.
+     */
+    aaudio_result_t start() override;
+
+    /**
+     * Stop the flow of data so that start() can resume without loss of data.
+     *
+     * This is not guaranteed to be synchronous but it currently is.
+     * An AAUDIO_SERVICE_EVENT_PAUSED will be sent to the client when complete.
+    */
+    aaudio_result_t pause() override;
+
+    /**
+     *  Discard any data held by the underlying HAL or Service.
+     *
+     * This is not guaranteed to be synchronous but it currently is.
+     * An AAUDIO_SERVICE_EVENT_FLUSHED will be sent to the client when complete.
+     */
+    aaudio_result_t flush() override;
+
+    aaudio_result_t close() override;
+
+    android::FifoBuffer *getDataFifoBuffer() { return mAudioDataQueue->getFifoBuffer(); }
+
+    void onStop();
+
+    void onDisconnect();
+
+protected:
+
+    aaudio_result_t getDownDataDescription(AudioEndpointParcelable &parcelable) override;
+
+    aaudio_result_t getFreeRunningPosition(int64_t *positionFrames, int64_t *timeNanos) override;
+
+private:
+    android::AAudioService  &mAudioService;
+    AAudioServiceEndpoint   *mServiceEndpoint = nullptr;
+    SharedRingBuffer        *mAudioDataQueue;
+};
+
+} /* namespace aaudio */
+
+#endif //AAUDIO_AAUDIO_SERVICE_STREAM_SHARED_H